A preparing method of a sintered silicon carbide porous material

A technology for sintering silicon carbide and porous materials, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of high preparation cost of porous silicon carbide ceramics, high price of pore-forming agents, environmental pollution, etc., and achieve reduction of production and preparation costs, Facilitate sintering and molding, shorten the effect of the preparation process

Inactive Publication Date: 2016-12-21
NINGBO DONGLIAN MECHANICAL SEAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these traditional methods for preparing porous ceramics usually need to add a large amount of organic pore-forming agents and binders. When organic matter is cracked at high temperature, a large amount of volatiles will be generated, causing environmental pollution and other problems. In addition, these pore-forming agents are expensive and have a large loss, resulting in The preparation cost of porous silicon carbide ceramics is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, the preparation method of sintered silicon carbide porous material comprises the following steps:

[0027] 1) After the main material is processed, it is a finished slurry, and the main material includes SiC pellets and B 4 C pellets, B 4 C pellets are used as sintering aids;

[0028] 2), adding auxiliary materials to the finished slurry product obtained in step 1) to prepare the pre-casting slurry, and keep stirring when adding, wherein the auxiliary materials include acrylamide, methylenebisacrylamide, ammonium polyacrylate;

[0029] 3) Die casting, add ammonium persulfate to the slurry before casting and stir evenly before die casting, demoulding into a green body;

[0030] 4), dehydration and degreasing, sintering, dehydration and degreasing is carried out in a drying environment for the green body, the drying environment is realized by room temperature through a heating process, and the final drying temperature of the drying environment (this te...

Embodiment 2

[0032] In this embodiment, the preparation method of sintered silicon carbide porous material comprises the following steps:

[0033] 1) After the main material is processed, it is a finished slurry, and the main material includes SiC pellets and B 4 C pellets, B 4 C pellets are used as sintering aids;

[0034] 2), adding auxiliary materials to the finished slurry product obtained in step 1) to prepare the pre-casting slurry, and keep stirring when adding, wherein the auxiliary materials include acrylamide, methylenebisacrylamide, ammonium polyacrylate;

[0035] 3) Die casting, add ammonium persulfate to the slurry before casting and stir evenly before die casting, demoulding into a green body;

[0036] 4), dehydration and degreasing, sintering, dehydration and degreasing is carried out in a drying environment for the green body, and the drying environment is realized through a heating process at room temperature, and the final drying temperature of the drying environment (t...

Embodiment 3

[0038] In this embodiment, the preparation method of sintered silicon carbide porous material comprises the following steps:

[0039] 1) After the main material is processed, it is a finished slurry, and the main material includes SiC pellets and B 4 C pellets, B 4 C pellets are used as sintering aids;

[0040] 2), adding auxiliary materials to the finished slurry product obtained in step 1) to prepare the pre-casting slurry, and keep stirring when adding, wherein the auxiliary materials include acrylamide, methylenebisacrylamide, ammonium polyacrylate;

[0041] 3) Die casting, add ammonium persulfate to the slurry before casting and stir evenly before die casting, demoulding into a green body;

[0042] 4), dehydration and degreasing, sintering, dehydration and degreasing is carried out in a drying environment for the green body, and the drying environment is realized through a heating process at room temperature, and the final drying temperature of the drying environment (t...

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PUM

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Abstract

A preparing method of a sintered silicon carbide porous material is disclosed. The method includes 1) a step of processing a main material into a pulp finished product, with the main material comprising a SiC granule material and a B4C granule material that is adopted as a sintering auxiliary, 2) a step of adding an auxiliary material into the pulp finished product prepared in the step 1) to prepare pulp before casting and stirring during addition, with the auxiliary material comprising acrylamide, methylenebisacrylamide and ammonium polyacrylate, 3) a step of performing mold casting, namely a step of adding ammonium persulfate into the pulp before casting, fully stirring, performing mold casting, and demolding to obtain a blank, and 4) a step of dewatering, degreasing and sintering. The SiC granule material having a small particle size is adopted as a gel main material and the B4C granule material having a large particle size is adopted as the sintering auxiliary and a skeleton material, thus achieving preparation of high-quality silicon carbide gel.

Description

technical field [0001] The invention relates to a preparation method of a porous silicon carbide material, in particular to a preparation method of a sintered silicon carbide porous material. Background technique [0002] Due to the advantages of low density, high temperature resistance, corrosion resistance, high permeability, good oxidation resistance and thermal shock resistance, porous silicon carbide ceramics are widely used in high temperature gas filter materials, catalyst carriers, gas combustion chamber media and refractory materials. It has broad application prospects. At present, the porous ceramics that have been widely used are mostly oxide ceramics, but they have disadvantages such as poor high-temperature performance and insufficient corrosion resistance, and porous silicon carbide ceramics can just make up for these deficiencies; in addition, many special fields require porous ceramic materials. The performance of silicon carbide puts forward higher requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/565
CPCC04B38/0045C04B35/565C04B2235/3821C04B2235/96
Inventor 李友宝励永平叶传剑
Owner NINGBO DONGLIAN MECHANICAL SEAL
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